LPS-44342 Added instructions for breaking change titles

Hi Jorge,
Here are a few minor changes for your review:

I added some guidelines for making titles. I think they'll make sure that the titles look like titles, distinguishing them from other parts of the entries. (I think Julio was on the right track with capitalization on his initial commit).

Also, I think using past tense in the title is natural for titling each change. 

Lastly, I bolded Date and Jira Ticket to make them stand out more. I used the dash '-' character for the bullet as it is still rendered as a round bullet, yet it is easily distinguishable from the bolding asterisks.

Thanks!